A Metal-Free Tandem Demethylenation/C(sp<sup>2</sup>)–H Cycloamination Process of <i>N</i>-Benzyl-2-aminopyridines via C–C and C–N Bond Cleavage
作者:Dongdong Liang、Yimiao He、Lanying Liu、Qiang Zhu
DOI:10.1021/ol4015656
日期:2013.7.5
A mild, metal-free synthesis of pyrido[1,2-a]benzimidazoles starting with N-benzyl-2-aminopyridines, which employs PhI(OPiv)2 as a stoichiometric oxidant, has been developed. The process is initiated by an unusual PhI(OPiv)2-mediated ipso SEAr reaction, followed by solvent-assisted C–C and C–N bond cleavage.
已经开发了一种轻度,无金属的合成方法,该方法以N-苄基-2-氨基吡啶为原料,以PhI(OPiv)2为化学计量氧化剂,合成了吡啶并[1,2- a ]苯并咪唑类化合物。该过程由一个不寻常的岛(OPiv)发起2介导的本位小号ë的Ar反应,接着进行溶剂辅助C-C和C-N键断裂。
Copper(II)-Mediated Aerobic Synthesis of Imidazo[1,2-<i>a</i>]pyridines via Cascade Aminomethylation/Cycloisomerization of Alkynes
作者:Irina V. Rassokhina、Valerii Z. Shirinian、Igor V. Zavarzin、Vladimir Gevorgyan、Yulia A. Volkova
DOI:10.1021/acs.joc.5b02102
日期:2015.11.6
A single copper(II)-catalyzed three-component cascade aminomethylation/cycloisomerization of propiolates to form imidazo[1,2-a]pyridines was explored. A straightforward method was developed for the practical synthesis of functionalized imidazo[1,2-a]pyridines from benzaldehydes, 2-aminopyridines, and propiolate derivatives catalyzed by Cu(OAc)2 hydrate in the presence of air. The protocol is marked
探索了单一的铜(II)催化的丙酸酯的三组分级联氨甲基化/环异构化形成咪唑并[1,2- a ]吡啶。开发了一种简单的方法,用于在空气中由Cu(OAc)2水合物催化从苯甲醛,2-氨基吡啶和丙酸酯衍生物实际合成官能化的咪唑并[1,2- a ]吡啶。该方案的特点是具有优异的收率,官能团耐受性,最重要的是具有合成咪唑并[1,2 - a ]吡啶基药物分子(如Alpidem)的适应性。
Physico-chemical Investigation of Th(IV) and UO2(VI) Complexes of Schiff Bases
作者:Sonal Agnihotri、Kishor Arora
DOI:10.14233/ajchem.2013.13960
日期:——
Schiff bases were obtained using p-methoxy benzaldehyde and p-chloro benzaldehyde and 2-amino pyridine to prepare new complexes of thorium(IV) and dioxouranium(VI) metals by various anions. The synthesized ligands and complexes were analytically studied through spectral studies, elemental analysis conductance measurements along with semi empirical and thermogravimetric methods. The complexes were assigned various coordination numbers ranging from 6-10 on the basis of these studies.
Novel one-pot pseudo four component reaction: expeditious synthesis of functionalized imidazo[1,2-a]pyridines
作者:Haleh Sanaeishoar、Roya Nazarpour、Fouad Mohave
DOI:10.1039/c5ra10891h
日期:——
A new and efficient one-pot synthesis of imidazo[1,2-a] pyridines is described. A C-3 imine substituent was installed on the imidazopyridine framework under mild conditions to form the corresponding products in good to excellent yields.
CuSO<sub>4</sub>–Glucose for in Situ Generation of Controlled Cu(I)–Cu(II) Bicatalysts: Multicomponent Reaction of Heterocyclic Azine and Aldehyde with Alkyne, and Cycloisomerization toward Synthesis of N-Fused Imidazoles
作者:Sankar K. Guchhait、Ajay L. Chandgude、Garima Priyadarshani
DOI:10.1021/jo3003024
日期:2012.5.4
ethanol (nonanhydrous) under open air has been explored. With this catalysis, the multicomponent cascade reaction of A3-coupling of heterocyclic amidine with aldehyde and alkyne, 5-exo-dig cycloisomerization, and prototropic shift has afforded an efficient and eco-friendly synthesis of therapeutically important versatile N-fused imidazoles. Diverse heterocyclic amidines, several of which are known to